1. Brand value: Cartier is a famous French jewelry brand with a long history and exquisite craftsmanship. Its brand status has been recognized by many royals and celebrities, which makes Cartier bracelets have high brand value.

2. Manufacturing technology and materials: Cartier bracelets are made of high-quality precious materials such as gold, platinum, rose gold and diamonds. Its manufacturing process involves many steps, including design, carving, inlay and so on. Each step is carefully made by skilled craftsmen, thus ensuring the unique charm and high quality of Cartier bracelets.

3. Designer: Cartier bracelets are carefully designed by world-class designers, who integrate unique design concepts and fashion elements into the bracelets, making Cartier bracelets unique and beautiful.

4. Limited production: limited production of Cartier bracelets makes them scarce and further enhances their value.

To sum up, Cartier bracelet is so expensive because of its excellent brand value, exquisite manufacturing technology and materials, unique design and limited production.